A pre-dawn sky calculator aligned to true sunrise azimuth for the selected place and date, framed in the shared CalculationTime calculator and clock system.
Inputs, result, proof and time.
Use the instrument above, then check the calculation record, assumptions and related tools below.
Direct answer
Sunrise Star Map in one sentence
The Sunrise Star Map calculates sunrise time, true sunrise azimuth and the one-hour-before-dawn star field for a selected place and date.
How to use this calculator
Choose the city or coordinates and set the observation date.
Read the calculated sunrise time and true azimuth before using the pre-dawn star map.
Print the dawn sky worksheet when you need the place, date, horizon assumptions and map context together.
Default result preview
Default solved state: selected place/date sunrise azimuth and pre-dawn star field
The client tool renders a solved dawn map immediately so readers and crawlers do not encounter a blank calculator.
How to prompt AI with this result
Copy this prompt with the visible result when you want a second-pass explanation, comparison or next-step checklist.
Use this CalculationTime result from Sunrise Star Map.
Direct answer: The Sunrise Star Map calculates sunrise time, true sunrise azimuth and the one-hour-before-dawn star field for a selected place and date.
Default result: Default solved state: selected place/date sunrise azimuth and pre-dawn star field
Method/formula: Sunrise uses solar altitude -0.833 degrees; the star map projects visible stars using local sidereal time for the selected latitude, longitude and date.
Source boundary: Educational sunrise and star-projection guide. The page uses a standard sunrise-altitude convention and Astronomy Engine context, but local terrain, weather and official almanac checks remain outside the calculation.
Explain the result, list the assumptions that matter, and suggest the next practical check without changing the original calculation.
Authority & freshness
Who checked this calculator?
Page structure checked: 2026-09-26. The sunrise altitude and horizon assumptions remain visible beside the tool.
Last verified:
Published by CalculationTime
CalculationTime publishes this tool with visible method notes, limits, related next steps and printable records so the result can be checked instead of treated as a black box.
Machine-readable formula
Sunrise uses solar altitude -0.833 degrees; the star map projects visible stars using local sidereal time for the selected latitude, longitude and date.The formula or method statement is rendered as text so crawlers and readers can extract the variables.
Source basis
2 source references support this page.
Boundary: Educational sunrise and star-projection guide. The page uses a standard sunrise-altitude convention and Astronomy Engine context, but local terrain, weather and official almanac checks remain outside the calculation.
If the live star map cannot render, the page still describes the selected place/date inputs, sunrise altitude assumption, sunrise azimuth target and sidereal star-projection method.
Static fallback text
The fallback reading is: solve sunrise near -0.833 degrees solar altitude, subtract one hour for the pre-dawn view, then project visible stars above a level mathematical horizon around the true sunrise azimuth.
What crawlers can extract
Input: observation date and anchor location.
Method: sunrise altitude correction plus local sidereal time.
Boundary: terrain, buildings, haze and weather are not modelled.
Why this matters
The interactive visual is helpful, but the method must remain understandable when JavaScript, canvas, iframe loading or graphics acceleration are unavailable.
Parameters
Sunrise star maps rely on date, location and true horizon geometry.
60 min before sunrise
Sunrise3 hours before
Geolocation
Latitude51.5072°N
Longitude0.1276°W
Syncing celestial catalog...
Live math canvas
Your numbers, formula and explanation together
The star map calculates sunrise time, true sunrise azimuth and the pre-dawn sky projection for the selected place and date.
Formula applied
The exact method behind this answer
CalculationTime keeps the method visible so the number can be checked instead of blindly trusted.
Sunrise is solved near solar altitude -0.833 degrees; the star map uses local sidereal time to project visible stars above the horizon.
Apply the methodSunrise is solved near solar altitude -0.833 degrees; the star map uses local sidereal time to project visible stars above the horizon.Sunrise azimuth and star fieldThe selected place and date determine the sunrise point and visible pre-dawn stars.
Your live breakdown
Current calculator context
This page keeps the active calculator, default worked example and method beside the tool so the answer is not separated from its arithmetic.
Calculator
Sunrise Star Map
Computed dawn sky
Sunrise azimuth and star field
Current method
Sunrise is solved near solar altitude -0.833 degrees; the star map uses local sidereal time to project visible stars above the horizon.
Resulting answer
Sunrise azimuth and star field
The selected place and date determine the sunrise point and visible pre-dawn stars.
Calculator
Sunrise Star Map
Computed dawn sky
Sunrise azimuth and star field
Current method
Sunrise is solved near solar altitude -0.833 degrees; the star map uses local sidereal time to project visible stars above the horizon.
Assumptions used
What this answer assumes
These boundaries keep the calculation honest and make clear when a specialist rule set is needed.
Sunrise uses a standard -0.833 degree altitude correction for refraction and solar semi-diameter.
The horizon is treated as a level mathematical horizon.
The star projection depends on latitude, longitude, date and local sidereal time.
Buildings, hills, elevation, haze and weather are not modelled.
Master’s Tip
How to use the result well
Master’s Tip: use the map as a planning guide, then check local horizon obstructions and weather before expecting the sky to match perfectly.
Printable record
What belongs in the saved calculation
For a selected city and date, the page finds the sunrise time, subtracts one hour for the pre-dawn view, then centres the map on the true sunrise azimuth.
Calculator
Sunrise Star Map
Computed dawn sky
Sunrise azimuth and star field
Current method
Sunrise is solved near solar altitude -0.833 degrees; the star map uses local sidereal time to project visible stars above the horizon.
Embeddable calculator
Embed this calculator
Copy a clean iframe version with the required CalculationTime attribution link built in.
Methodology & Accuracy
Calculation method and limits
The page combines a standard sunrise altitude correction, Julian-date solar position arithmetic and local sidereal time to draw a practical pre-dawn sky view.
Mathematical assumptions
Sunrise is anchored to -0.833 degrees solar altitude, combining standard atmospheric refraction and the solar semi-diameter used for upper-limb sunrise estimates.
Sky projection
The map evaluates local sidereal time, projects visible stars above the horizon, and centres the view on the calculated sunrise azimuth.
Horizon limitations
Results assume a level mathematical horizon. Hills, buildings, elevation, weather and magnetic declination can change field observations.
Print room: dawn sky worksheet
Print the sunrise-time and star-map context so the selected place, date, azimuth and horizon assumptions stay together.
Source ownerSunrise altitude correction, local sidereal projection and CalculationTime star-map rendering.
Best usePlanning or teaching the pre-dawn sky above the true sunrise point.
BoundaryLevel-horizon model; buildings, terrain, elevation, haze and weather are outside the calculation.
Before using the worksheet, check the selected place/date, high-latitude boundary, mobile controls, labels and printed dawn sheet.